You are looking at an encrypted file. Most CFML files within the CFIDE folder are encrypted to protect the code from prying eyes. This has nothing to do with IIS.
A short description about this topic you can find here.
Unless there is any batch encryption in place for your own files, then you should be able to open up your own code and you will see the readable content. If you accidentally encoded your own files, then you will have to restore your backup or get the original files from source control. In the past Google search brought up a (technically illegal) tool for unencrypting such files. I've no idea whether this still works with newer ColdFusion editions.
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